Lets keep things on topic about the actual purpose of the original topic, baiting, trolling about each other is pointless.
If you do not have anything to say about the actual subject then please don't say anything.
I've never experienced any bt problems myself but saying that I have never used it in my car. I know some car units can be temperamental.
There is talk of a bt update in the works from MS, wmpoweruser had a story about it recently so that may improve your problems along with the Denim update that is currently being rolled out.
You will not get an electric shock from the device, more likely you discharged your own bodies built up static to the device.
Its quite common and I know of people who get this from plugging in headphones on their pc etc.
You may even have some of your problems because of your static discharge.
I remember back in the WM days there was talk about adding memory to SIM cards so they would be a SIM and storage at the same time with ideas of a whopping 64mb lol, never did really take off as such especially as we are now in the GB era and fast approaching the TB range.
Go to Amazon and try the Anker 40w five port charger for £19.99 that's kicking out more than what you are looking for it seems :-)
Unfortunately IE is not allowing me to paste the link in the reply here.
Reading a bit more it seems that each port is 2.4A but that seems to be the max standard.